<template>
  <div class="swiper-container" ref="box">
    <div class="swiper-wrapper">
      <div
        class="swiper-slide"
        v-for="(slider, index) in skuImageList"
        :key="slider.id"
      >
        <img
          :src="slider.imgUrl"
          @click="enterHandler(index)"
          :class="{ active: currentIndex === index }"
        />
      </div>
    </div>
    <div class="swiper-button-next" @click="add"></div>
    <div class="swiper-button-prev" @click="minus"></div>
  </div>
</template>
<script>
//引包
import Swiper from "swiper";
import "swiper/css/swiper.min.css";
export default {
  name: "ImageList",
  data() {
    return {
      currentIndex: 0,
    };
  },
  props: ["skuImageList"],
  //watch监听数据变化
  watch: {
    skuImageList(val) {
      //$nextTick:修改响应式数据的时候,获取更新后的DOM！！！！！
      this.$nextTick(() => {
        new Swiper(this.$refs.box, {
          //同时展示两个slider->两张图片
          slidesPerView: 2,
          navigation: {
            nextEl: ".swiper-button-next",
            prevEl: ".swiper-button-prev",
          },
        });
      });
    },
  },
  methods: {
    enterHandler(index) {
      this.currentIndex = index;
      //全局事件总线:实现兄弟组件通信
      this.$bus.$emit("currentIndex", index);
    },
    add() {
      this.currentIndex++;
      //数组长度减去1
      let number = this.skuImageList.length - 1;
      if (this.currentIndex > number) {
        this.currentIndex = number;
      }
      this.$bus.$emit("currentIndex", this.currentIndex);
    },
    minus() {
      this.currentIndex--;
      if (this.currentIndex < 0) {
        this.currentIndex = 0;
      }
      this.$bus.$emit("currentIndex", this.currentIndex);
    },
  },
};
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>